Main-electric auxiliary bag type composite dust collector

Abstract

The utility model discloses a main-electric-auxiliary-bag type composite dust remover, relates to the technical field of dust removal, and can improve the trapping capability and the application range of an electric dust remover. According to the dust remover, an electric dust removal module comprises at least one electric trapping area, each electric trapping area is composed of a plurality of electric field channels, each electric field channel comprises two anode plate row sets and a cathode row set, each anode plate row set is composed of a plurality of anode plates, and each cathode row set is composed of a plurality of discharge wires and dust collection plates; each of a first plate surface and a second plate surface in the plate sheet structure of the anode plate is formed by sequentially arranging a plurality of arc-shaped plates, and an opening formed by the arc-shaped plates faces the interior of the plate sheet structure; the periphery of the plate sheet structure is composed of an upper sealing plate, a lower sealing plate, a front open groove and a rear clamping groove, and a dust collecting pipe is arranged at the position close to the rear clamping groove. Particulate matters in the flue gas are adsorbed to the plate structures under the action of airflow drag force and electric field force, and the particulate matters secondarily escaping from the plate structures enter the dust collecting pipes; and the bag dust removal module collects particulate matters from the dust collection pipe.

Description

Technical Field

[0001] This application relates to the field of dust removal technology, and in particular to a main electrostatic precipitator and auxiliary bag filter composite dust collector. Background Technology

[0002] Electrostatic precipitators (ESPs) have been widely used in industries such as thermal power, metallurgy, building materials, and chemicals due to their advantages such as low voltage drop, stable operation, and strong adaptability. The structural design of the ESP body, flue gas conditions, dust characteristics, and operation are important factors affecting the efficient and stable operation of the ESP's electric field. Among these, dust particle size and dust resistivity are key factors determining whether dust can be effectively collected after entering the electric field.

[0003] Traditional electrostatic precipitator-baghouse hybrid dust collectors consist of an electrostatic precipitator in front and a baghouse dust collector behind. The electrostatic precipitator collects most of the dust, while the baghouse dust collector collects the dust that escapes secondary to the surface and is difficult for the electrostatic precipitator to capture. This results in a large number of electrodes in the electrostatic precipitator and a large area of ​​filter media used in the baghouse dust collector, leading to high investment and high operating costs. Utility Model Content

[0004] This application provides a main electrostatic precipitator and auxiliary bag filter composite dust collector. On the one hand, it can improve the collection capacity of electrostatic precipitators for positively charged particles, high resistivity dust, and low resistivity dust, thereby expanding the application range of electrostatic precipitators. On the other hand, it can collect and filter this part of the dust before it escapes and diffuses again, using a novel electrode surface structure and gas collection method. The amount of flue gas filtered by the bag filter is only a small part of the amount of flue gas processed by the electrostatic precipitator, reducing the amount of flue gas filtered by the bag filter, thereby reducing the equipment specifications, lowering the total construction cost and operating cost of the equipment.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides a main electrostatic precipitator and an auxiliary bag filter composite dust collector, the dust collector comprising: an electrostatic precipitator module and a bag filter module;

[0007] The electrostatic precipitator module includes at least one electrostatic collection zone, which is composed of multiple electric field channels. Each electric field channel includes two rows of anode plate groups and one row of cathode plate groups. The anode plate groups are composed of multiple independent anode plates.

[0008] The anode plate is a hollow plate structure, which is arranged parallel to the flue gas flow direction. The plate structure includes a first plate surface and a second plate surface. Both the first plate surface and the second plate surface are composed of multiple arc-shaped plates arranged in sequence. The openings formed by the arc-shaped plates of the first plate surface and the corresponding arc-shaped plates of the second plate surface face the interior of the plate structure. The openings formed by the arc-shaped plates of the first plate surface and the openings formed by the arc-shaped plates of the second plate surface are staggered.

[0009] The plate structure is composed of an upper sealing plate, a lower sealing plate, a front slot and a rear slot. The upper sealing plate and the lower sealing plate are parallel to the flue gas flow direction. A dust collection pipe is also provided between the front slot and the rear slot and adjacent to the rear slot.

[0010] The flue gas first enters the electrostatic precipitator module. The particulate matter in the flue gas enters and is adsorbed into the plate structure under the action of airflow drag force and electric field force. The particulate matter that escapes from the plate structure enters the dust collection pipe.

[0011] The bag filter module is used to collect particulate matter from the dust collection pipe.

[0012] In one embodiment, the bag filter module includes a piping system, a circulating fan, a control unit, and a bag filter.

[0013] The dust collection pipe is connected to the bag filter through the pipeline system, and the bag filter is also connected to the circulating fan;

[0014] The control unit is used to control the rotational speed of the circulating fan, the inlet and outlet flue gas pressure of the management system, and the flue gas pressure in the dust collection pipe and pipeline system, so that after the dust collection pipe and pipeline system form the negative pressure state required by the design, the secondary escaped particles enter the dust collection pipe and pipeline system, and the dust collector collects the particles in the dust collection pipe.

[0015] In one embodiment, the piping system includes: multiple pneumatic fittings, multiple branch pipes, an electric regulating valve, and a main pipe;

[0016] One of the pneumatic connectors is used to connect one of the dust collection pipes and one of the branch pipes, each of the branch pipes is equipped with an electric regulating valve, and the branch pipes merge to form the main pipe;

[0017] The main pipeline is connected in sequence to the bag filter and the circulating fan, and the control unit is connected to the circulating fan and the electric regulating valve respectively;

[0018] The control unit is specifically used to control the rotational speed of the circulating fan, the inlet and outlet flue gas pressure, and the opening of the electric regulating valve, so that after a set negative pressure is formed in the dust collection pipe and the branch pipe, the particles that escaped from the plate structure for the second time enter the dust collection pipe, and the dust collector collects the particles in the dust collection pipe.

[0019] In one embodiment, the front slot and the rear slot are both U-shaped structures, and the width of the rear slot is greater than the width of the front slot.

[0020] In one embodiment, the cathode array consists of multiple cathode wires and cathode dust collection plates;

[0021] The cathode wires include needle wires, barbed wires, serrated wires, and spiral wires.

[0022] In one embodiment, the cathode dust collection plate adopts an anode-like plate structure, wherein the anode-like plate structure is a structure in which the plate structure does not include the dust collection pipe and the lower sealing plate has no through holes.

[0023] In one embodiment, the electrostatic precipitator module further includes a flue gas channel, which is provided with an air inlet and an air outlet. The cross-sectional area of ​​the air inlet is smaller at the front and larger at the back, while the cross-sectional area of ​​the air outlet is larger at the front and smaller at the back.

[0024] In one embodiment, two adjacent anode plates in the same row of the electrostatic precipitator module have opposite orientations, and two adjacent anode plates in the same column have opposite orientations.

[0025] The cathode wires and the cathode dust collection plate are arranged alternately.

[0026] In one embodiment, the bag filter includes: a cloth bag filter and a metal filter bag filter;

[0027] The filter media materials of the bag filter include polyphenylene sulfide (PPS), polyimide (PI), polytetrafluoroethylene (PTFE), stainless steel, and intermetallic compounds.

[0028] The bag filter of the bag filter includes pleated filter bags and pleated filter cartridges.

[0029] In one embodiment, the dust collection pipe has multiple rectangular holes, and the area of ​​the rectangular holes farther away from the upper sealing plate is smaller, so as to ensure that the negative pressure at each rectangular hole is consistent.

[0030] The beneficial effects of the technical solutions provided in this application include at least the following:

[0031] The main-electro-auxiliary bag filter composite dust collector provided in this application includes an electrostatic precipitator module and a bag filter module; wherein, the electrostatic precipitator module includes at least one electrostatic collection zone, the electrostatic collection zone is composed of multiple electric field channels, one of the electric field channels includes two rows of anode plate groups and one row of cathode groups, the anode plate groups are composed of multiple independent anode plates; the anode plates are hollow plate structures, the plate structures are arranged parallel to the flue gas flow direction, the plate structures include a first plate surface and a second plate surface, both the first plate surface and the second plate surface are composed of multiple arc-shaped plates arranged sequentially, the first plate surface... The opening formed by the arc-shaped plate and the corresponding arc-shaped plate of the second plate faces inward toward the interior of the plate structure; the plate structure is composed of an upper sealing plate, a lower sealing plate, a front slot and a rear slot. The upper and lower sealing plates are parallel to the flue gas flow direction. A dust collection pipe is also provided between the front slot and the rear slot and adjacent to the rear slot; the flue gas first enters the electrostatic precipitator module. The particulate matter in the flue gas enters and is adsorbed into the plate structure under the action of airflow drag and electric field force. The particulate matter that escapes from the plate structure enters the dust collection pipe in the rear slot of the anode plate; the bag filter module is used to collect particulate matter from the dust collection pipe. The main-electro-auxiliary bag-type composite dust collector provided in this application overcomes the problem of effectively capturing fine particles and high / low resistivity dust after being charged in an electric field by the plate structure of the anode plate. The cathode dust collection plate increases the cathode dust collection area, allowing for the effective capture of positively charged dust particles in the electric field. The bag filter collects particles from the dust collection tube, solving the problem of secondary dust generation caused by rapping cleaning and the characteristics of high / low resistivity dust, thus improving overall dust removal efficiency and achieving ultra-low emissions for difficult-to-collect dust while reducing the size selection of the electrostatic precipitator. Before the secondary dust caused by rapping cleaning and the characteristics of high / low resistivity dust diffuses, this part of the dust is collected and filtered using the novel electrode plate structure and gas collection method. The filtration volume of the bag filter is only a small fraction of the flue gas volume handled by the electrostatic precipitator, reducing the size selection of the bag filter and thus lowering the total construction and operating costs of the equipment.

[0032] The main electrostatic precipitator and auxiliary bag filter of this application is a composite dust collector with electrostatic precipitator as the main component and bag filter as the auxiliary component. It breaks the traditional structure of electrostatic precipitator in front and bag filter in the back. The amount of flue gas treated by the bag filter is greatly reduced, and the construction cost and equipment operation cost are low. Attached Figure Description

[0033] Figure 1 A top-view cross-sectional view of a main-electric auxiliary bag-type composite dust collector provided in an embodiment of this application;

[0034] Figure 2 A cross-sectional view of a main-electric auxiliary bag-type composite dust collector provided in this application embodiment from a left-side view perspective;

[0035] Figure 3A schematic diagram of an electrostatic precipitator for capturing particulate matter is provided in an embodiment of this application.

[0036] Figure 4 This is a structural diagram of an anode plate provided in an embodiment of this application.

[0037] Figure Labels

[0038] 1~Flue gas passage; 2~Electrostatic collection area; 3~Anode plate; 3-1~Upper sealing plate; 3-2~Lower sealing plate; 3-3~Arc plate; 3-4~Front slot; 3-5~Rear slot; 3-6~Dust collection pipe; 3-7~Rectangular hole; 4~Cathode wire; 5~Cathode dust collection plate; 6~Air inlet; 7~Air outlet; 8~Airflow distribution plate; 9~Pneumatic connector; 10~Branch pipeline; 11~Main pipeline; 12~Bag dust collector; 13~Circulating fan; 14~Control unit. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0041] In addition, the use of “based on” or “according to” implies openness and inclusivity, because processes, steps, calculations or other actions “based on” or “according to” one or more conditions or values ​​can in practice be based on additional conditions or values ​​beyond those conditions.

[0042] Electrostatic precipitators (ESPs) have been widely used in industries such as thermal power, metallurgy, building materials, and chemicals due to their advantages such as low voltage drop, stable operation, and strong adaptability. The structural design of the ESP body, flue gas conditions, dust characteristics, and operation are important factors affecting the efficient and stable operation of the ESP's electric field. Among these, dust particle size and dust resistivity are key factors determining whether dust can be effectively collected after entering the electric field.

[0043] The working principle of an electrostatic precipitator: A corona discharge is formed between the cathode system, connected to a high-voltage, grounded anode plate. This ionizes the air, generating negative ions that collide with dust particles, charging them. The charged dust particles are then driven into the anode plate by the electric field for dust collection. As the applied voltage to the electrostatic precipitator's electric field increases until a spark is generated during discharge, electron avalanches occur within the corona region, generating a large number of negative ions. A certain spark rate ensures sufficient negative ions in the electric field space for dust removal. Outside the corona region, the electric field discharge creates a high-conductivity mixed zone of positive and negative ions, also generating a certain amount of positive ions. These positive ions collide with dust particles to form positive particles, which are driven into the cathode discharge electrode. Due to the limited surface area of ​​the cathode discharge electrode, a large number of positive particles escape, affecting the dust collection efficiency of the electrostatic precipitator.

[0044] Dust particles entering an electric field are charged through two main methods: electric field charging and diffusion charging. Existing research indicates that dust particles larger than 1 μm are primarily charged by electric field charging, while those smaller than 0.1 μm are primarily charged by diffusion charging. Dust particles between 0.1 and 1 μm exhibit both charging methods. This makes it difficult to charge fine particles ≤0.1 μm, resulting in low charge and impacting the dust collection efficiency of electrostatic precipitators. Considering the adaptability of electrostatic precipitators to dust, the generally accepted dust resistivity is around 10⁻⁶ Ω·cm. 6 ~10 11 Dust particles in the Ω·cm range are well-suited for electrostatic precipitators. However, for dust particles such as carbon black and high-temperature flue gas (≥350℃), which have low resistivity, charged dust particles quickly release their charge after reaching the collecting electrode, detach from the collecting plate, and return to the airflow. They then recharge and are collected again in the electric field, repeating this process repeatedly. This jumping between the plates causes secondary dust re-entrainment and affects the dust collection efficiency of the electrostatic precipitator.

[0045] When high resistivity dust enters the electric field, due to the poor conductivity of the particles, the charge is released slowly after reaching the dust collecting plate, resulting in dust accumulation on the surface of the dust collecting plate. When the electric field strength in the dust layer exceeds its critical value, local breakdown occurs in the pores of the dust layer, generating a back corona and producing positive ions with the opposite charge to the corona electrode. The generated ions then move towards the corona electrode, neutralizing the negatively charged particles in the corona region, leading to an increase in current and a decrease in voltage. This results in severe secondary dust re-entrainment and a decrease in dust removal efficiency. To improve the ability of electrostatic precipitators (ESPs) to capture positive particles within the electric field, address the low collection efficiency of fine particulate matter caused by the ion wind effect of the electric field, and mitigate the secondary dust generation problem that ESPs easily generate when collecting high- and low-resistivity dust, this application optimizes the electric field structure of traditional ESPs and adds a bag filter to re-capture secondary dust generated within the electric field. This results in a main-electrostatic-auxiliary-bag composite dust collector that achieves ultra-low emissions of difficult-to-collect dust. This design breaks away from the traditional front-electrostatic-back bag filter structure, significantly reducing the amount of flue gas that the bag filter can handle and lowering construction costs.

[0046] like Figures 1-4 As shown, this application provides a composite electrostatic precipitator, which includes an electrostatic precipitator module and a bag filter module. The electrostatic precipitator module includes at least one electrostatic collection zone 2, which is composed of multiple electric field channels. Each electric field channel includes two rows of anode plate groups and one row of cathode plate groups. The anode plate groups are composed of multiple independent anode plates 3.

[0047] The anode plate 3 is a hollow plate structure, which is arranged parallel to the flue gas flow direction. The plate structure includes a first plate surface and a second plate surface. Both the first plate surface and the second plate surface are composed of multiple arc-shaped plates 3-3 arranged in sequence. The opening direction formed by the arc-shaped plates 3-3 on the first plate surface and the corresponding arc-shaped plates 3-3 on the second plate surface faces the interior of the plate structure. The plate structure is composed of an upper sealing plate 3-1, a lower sealing plate 3-2, a front slot 3-4, and a rear slot 3-5. The upper sealing plate 3-1 and the lower sealing plate 3-2 are parallel to the flue gas flow direction. A dust collection pipe 3-6 is also provided between the front slot 3-4 and the rear slot 3-5 and adjacent to the rear slot 3-5.

[0048] The flue gas first enters the electrostatic precipitator module, where particulate matter in the flue gas enters and is adsorbed into the plate structure under the action of airflow drag and electric field force. Particulate matter that escapes from the plate structure enters the dust collection pipe 3-6. The bag filter module is used to collect particulate matter from the dust collection pipe 3-6.

[0049] Optionally, the electrostatic precipitator module further includes a flue gas channel 1, the channel between the two rows of anode plates 3 is a flue gas channel 1, and the electrostatic collection area 2 is composed of several flue gas channels 1; the flue gas channel 1 is provided with an air inlet 6 and an air outlet 7, and the cross-sectional area of ​​the air inlet 6 and the air outlet 7 is set according to the flue gas flow direction.

[0050] In other words, the electrostatic precipitator module includes a flue gas channel 1 and an electrostatic collection zone 2. The electrostatic collection zone 2 has at least two groups, and each group of the electrostatic collection zone 2 includes at least two rows of anode plate groups. In the same row of anode plate groups, there are several anode plates 3 arranged parallel to the flue gas flow direction. In the same row of anode plate groups, there are cathode wires 4 or cathode dust collection plates 5 between adjacent anode plates 3.

[0051] Optionally, both the front slot 3-4 and the rear slot 3-5 are U-shaped structures, and the width of the rear slot 3-5 is greater than the width of the front slot 3-4.

[0052] It is understandable that the anode plate 3 is a box-type plate structure, comprising an upper sealing plate 3-1, a lower sealing plate 3-2, two rows of staggered arc-shaped plates 3-3 arranged in the direction of flue gas flow, and a front slot 3-4 and a rear retaining slot 3-5 located at the front and rear ends of the arc-shaped plates 3-3. The upper sealing plate 3-1, lower sealing plate 3-2, front slot 3-4, and rear retaining slot 3-5 combine to form the plate structure of the anode plate 3, and the arc-shaped plates 3-3 are fixed within this plate structure. The width of the frame groove of the rear retaining slot 3-5 of the anode plate 3 is greater than the width of the frame groove of the front slot 3-4, which facilitates the entry of dust escaping from the front end into the rear retaining slot 3-5 for re-collection. The openings formed by the arc-shaped plates 3-3 on the first plate and the corresponding arc-shaped plates 3-3 on the second plate face inward toward the interior of the plate structure. This conforms to the parabolic motion tendency of charged dust under the action of electric field force to drive into the anode plate 3, so that the particulate matter in the flue gas can enter and be adsorbed into the plate structure under the action of airflow drag force and electric field force.

[0053] In addition, the upper sealing plate 3-1 and the lower sealing plate 3-2 are firmly welded to the front slot 3-4 and the rear retaining slot 3-5. The lower sealing plate 3-2 has a through hole at its rear end. A dust collection pipe 3-6, which is the same length as the anode plate 3, is arranged in the rear retaining slot 3-5. The lower end of the dust collection pipe 3-6 is welded to the through hole and is tapped or threaded to form an internal thread. The upper end of the dust collection pipe 3-6 is sealed to the upper sealing plate 3-1. The dust collection pipe 3-6 has several rectangular holes 3-7 from top to bottom in the windward direction. The area of ​​the rectangular holes 3-7 that are farther away from the upper sealing plate 3-1 is smaller to ensure that the negative pressure at each rectangular hole is consistent.

[0054] Optionally, the cathode includes a cathode wire 4 and a cathode dust collection plate 5; the cathode wire 4 includes needle wire, barbed wire, and spiral wire. The cathode dust collection plate 5 adopts an anode-like plate structure, which is a structure in which the plate structure does not include the dust collection tube 3-6 and the lower sealing plate 3-2 has no through holes.

[0055] In other words, the cathode dust collection plate 5 has a similar structure to the anode plate 3. However, unlike the anode plate 3, the rear slot 3-5 of the cathode dust collection plate 5 does not have a dust collection pipe 3-6, and the lower sealing plate 3-2 of the cathode dust collection plate 5 does not have a through hole.

[0056] In the electrostatic precipitator module, two adjacent anode plates 3 located in the same row face opposite directions, and two adjacent anode plates 3 located in the same column face opposite directions; the cathode wires 4 and the cathode dust collection plates 5 are arranged alternately. Specifically, one cathode wire 4 and a set of cathode dust collection plates 5 are arranged alternately, or two cathode wires 4 and a set of cathode dust collection plates 5 are arranged alternately.

[0057] Optionally, the bag filter module includes a piping system, a circulating fan 13, a control unit 14, and a bag filter 12;

[0058] The dust collection pipe 3-6 is connected to the bag filter 12 through the pipeline system, and the bag filter 12 is also connected to the circulating fan 13; the control unit 14 is used to control the power of the circulating fan 13 and the air pressure in the pipeline system, so that after a negative pressure state is formed in the branch pipeline 10, the bag filter 12 is used to collect the particulate matter in the dust collection pipe 3-6.

[0059] Specifically, the piping system includes: multiple pneumatic joints 9, multiple branch pipes 10, electric regulating valves, and a main pipe 11;

[0060] A pneumatic connector 9 is used to connect a dust collection pipe 3-6 and a branch pipe 10. Each branch pipe 10 is equipped with an electric regulating valve, and the branch pipes 10 converge to form the main pipe 11. The main pipe 11 is connected in sequence to the bag filter 12 and the circulating fan 13. The control unit 14 is connected to the circulating fan 13 and the electric regulating valve respectively. The control unit 14 is specifically used to control the power of the circulating fan 13 and the electric regulating valve so that a negative pressure is formed in the branch pipe 10, and the bag filter 12 collects the particulate matter in the dust collection pipe 3-6.

[0061] Optionally, the bag dust collector 12 includes: a cloth bag dust collector and a metal filter bag dust collector; the filter material of the cloth bag dust collector includes polyphenylene sulfide (PPS), polyimide (PI), or polytetrafluoroethylene (PTFE).

[0062] The control unit 14 can be a programmable logic controller (PLC) or other control devices or chips.

[0063] During operation, electrically adjustable valves are installed in the branch pipes 10. After the electrically adjustable valves, the branch pipes 10 converge to form the main pipe 11. The circulating fan 13 is started, and the negative pressure flow rate of the branch pipes 10 is adjusted by controlling the opening of the electrically adjustable valves and the power of the circulating fan 13 through the PLC. A slight negative pressure state is formed in the cavity at each opening of the dust collection pipe 3-6 to prevent the dust that has been captured to the anode plate 3 from escaping back into the electric field space. The dust-laden flue gas that enters the dust collection pipe 3-6 re-enters the bag filter 12. After being efficiently filtered and captured by the bag filter 12, the clean flue gas enters the flue gas outlet 7 of the electrostatic precipitator with the circulating fan 13 and mixes with the clean flue gas of the electrostatic precipitator. In addition, the bag filter module, as a re-capture device for the dust that escapes from the electrostatic precipitator, has a small flue gas volume and occupies little space, and can be arranged in the space on the top or sides of the electrostatic precipitator.

[0064] like Figure 1 and Figure 3 As shown, Figure 1 , Figure 3 The arrows in the diagram indicate the direction of flue gas flow. Figure 3The arc-shaped arrow from the cathode to the anode plate 3 indicates the direction of the electric field, and the irregular line segments represent the trajectories of the particles. For example... Figure 3 As shown, the dust-laden flue gas flows uniformly into the electric field under the action of the airflow distribution plate 8. The cathode corona is generated under high voltage power supply, and negative ions are generated in the corona region. The discharge in the outer corona region forms a mixed region of positive and negative ions with high conductivity. The particulate matter in the flue gas enters the electric field and collides with the positive and negative ions to become charged. The positive and negative particles move in parabolic motion towards the cathode, the cathode dust collection plate 5 and the anode plate 3 respectively under the action of the electric field force. Low-resistivity dust and high-resistivity dust enter the electric field and become charged. Under the action of the electric field force, they undergo parabolic motion and are driven into the anode plate 3. After reaching the anode plate 3, they enter the space of the arc-shaped plate 3-3 of the box plate structure. The charged dust is collected in the arc-shaped plate 3-3, the front slot 3-4, and the rear slot 3-5 under the action of the electric field force and the airflow vortex. Most of the dust accumulates in the rear slot 3-5. Under the action of the rapping force, the collected dust, low-resistivity dust, and high-resistivity dust easily detach from the anode plate 3 and escape. At this time, the cavities at the several through holes of the dust collection pipe 3-6 arranged in the rear slot 3-5 of the anode plate 3 form a local micro-negative pressure, which draws the escaped dust into the dust collection pipe 3-6 and into the bag dust collector 12 for further collection.

[0065] Fine dust particles have a small charge in the electric field and are driven into the anode plate 3 by the ion wind. The interlaced arrangement of the arc-shaped plates 3-3 alters the double-helix structure of the ion wind. The fine dust particles collide and deposit under the multiple vortex action of the arc-shaped plates 3-3, which is beneficial for the collection of fine dust particles. The anode plate 3 and the cathode dust collection plate 5 have the same structure, but the width of the cathode dust collection plate 5 in the direction of flue gas flow is less than or equal to the width of the anode plate 3. This ensures that there is a certain distance between the cathode wire 4 and the cathode dust collection plate 5, avoiding interference from high-voltage corona discharge.

[0066] In summary, the main-electrostatic precipitator and auxiliary bag filter composite dust collector provided in this application overcomes the problem of effectively capturing fine particles and high- and low-resistivity dust after being charged in an electric field by the plate structure of the anode plate 3. The bag filter 12 collects particles from the dust collection pipes 3-6, solving the problem of secondary dust generation caused by rapping cleaning and the characteristics of high- and low-resistivity dust, thereby improving the overall dust removal efficiency and achieving ultra-low emissions for difficult-to-collect dust. Furthermore, the main-electrostatic precipitator and auxiliary bag filter composite dust collector of this application uses electrostatic precipitator as the main component and bag filter as the auxiliary component, breaking the traditional front-electrostatic-back-bag filter structure of the electrostatic precipitator 12. This significantly reduces the amount of flue gas processed by the bag filter 12 and lowers the construction cost. Moreover, the cathode dust collection plate 5 adopts the same box-type plate structure, significantly increasing the dust collection area and effectively capturing positive particles in the electric field, thus expanding the applicability of the electrostatic precipitator.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above embodiments merely illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A primary electric auxiliary bag type composite dust collector, characterized by, The dust collector comprises an electric dust removal module and a bag dust removal module; The electric dust removal module comprises at least one electric collection zone, and the electric collection zone is composed of a plurality of electric field channels, one of the electric field channels comprises two anode plate row groups and one cathode row group, and the anode plate row group is composed of a plurality of independent anode plates; The anode plate is a hollow plate structure, the plate structure is arranged along the parallel direction of the flue gas flow, the plate structure comprises a first plate surface and a second plate surface, the first plate surface and the second plate surface are both composed of a plurality of arc-shaped plates arranged in sequence, the opening direction formed by the arc-shaped plates of the first plate surface and the arc-shaped plates at the corresponding position of the second plate surface faces the inside of the plate structure, and the opening formed by the arc-shaped plates of the first plate surface is arranged staggered with the opening formed by the arc-shaped plates of the second plate surface; The periphery of the plate structure is composed of an upper sealing plate, a lower sealing plate, a front slot and a rear clamping slot, the upper sealing plate and the lower sealing plate are parallel to the flue gas flow direction, and a dust collection pipe is further arranged at the position adjacent to the rear clamping slot; The flue gas first enters the electric dust removal module, the particulate matters in the flue gas enter and are adsorbed into the plate structure under the action of the gas flow drag force and the electric field force, and the particulate matters that secondarily escape from the plate structure enter the dust collection pipe; The bag dust removal module is used for collecting particulate matters from the dust collection pipe.

2. The dust extractor according to claim 1, characterized in that The bag dust removal module comprises a pipeline system, a circulating fan, a control unit and a bag dust collector; The dust collection pipe is connected with the bag dust collector through the pipeline system, and the bag dust collector is further connected with the circulating fan; The control unit is used for controlling the rotating speed of the circulating fan, the inlet and outlet flue gas pressures of the pipeline system and the flue gas pressures in the dust collection pipe and the pipeline system, so that the particulate matters that secondarily escape from the plate structure enter the dust collection pipe and the pipeline system after a designed negative pressure state is formed in the dust collection pipe and the pipeline system, and the particulate matters in the dust collection pipe are collected by the bag dust collector.

3. The dust extractor according to claim 2, characterized in that The pipeline system comprises a plurality of pneumatic joints, a plurality of branch pipelines, electric regulating valves and a main pipeline; One of the pneumatic joints is used for connecting one of the dust collection pipes and one of the branch pipelines, the electric regulating valves are arranged on the branch pipelines, and the branch pipelines are connected in parallel to form the main pipeline; The main pipeline is connected with the bag dust collector and the circulating fan in sequence, and the control unit is connected with the circulating fan, the bag dust collector and the electric regulating valves respectively; The control unit is specifically used for controlling the rotating speed of the circulating fan, the inlet and outlet flue gas pressures and the opening degree of the electric regulating valve, so that the particulate matters that secondarily escape from the plate structure enter the dust collection pipe after a designed negative pressure state is formed in the dust collection pipe and the branch pipeline, and the particulate matters in the dust collection pipe are collected by the bag dust collector.

4. The dust extractor according to claim 1, characterized in that The front slot and the rear clamping slot are both U-shaped structures, and the width of the rear clamping slot is greater than the width of the front slot.

5. The dust extractor according to claim 1, characterized in that The cathode row group is composed of a plurality of cathode wires and cathode dust collection plates; The cathode wire comprises a needle wire, a thorn wire, a sawtooth wire and a spiral wire.

6. The dust extractor according to claim 5, characterized in that The cathode dust collecting plate adopts a quasi-anode plate structure, which is a structure without the dust collecting pipe and without a through hole on the lower sealing plate in the plate structure.

7. The dust extractor according to claim 1, characterized in that The electric dust removal module further comprises a flue gas channel; The flue gas channel is provided with an air inlet and an air outlet, the cross-sectional area of the air inlet is smaller in front and larger at the rear, and the cross-sectional area of the air outlet is larger in front and smaller at the rear.

8. The dust extractor according to claim 5, characterized in that The directions of two anode plates located in the same row and adjacent to each other in the electric dust removal module are opposite, and the directions of two anode plates located in the same column and adjacent to each other are opposite. The cathode lines and the cathode dust collecting plates are staggered.

9. The dust extractor according to claim 2, characterized in that The bag dust collector comprises a cloth bag dust collector and a metal filter bag dust collector. The cloth bag filter material of the cloth bag dust collector comprises polyphenylene sulfide PPS, polyimide PI or polytetrafluoroethylene PTFE, stainless steel material, and intermetallic compound. The cloth bag dust collector comprises a pleated filter bag and a pleated filter cylinder.

10. The dust extractor according to claim 1, characterized in that A plurality of rectangular holes are formed on the dust collecting pipe, and the farther the rectangular hole is from the upper sealing plate, the smaller the area of the rectangular hole.

Images